According to the UN Population Bureau, life expectancy in 2200 will be around 100 for developed countries and the world population will be about 11 billion. However, the UN has warned that these projections could be invalidated by any change and progress in future life extension technology and discoveries, as well as changes in future birthrates.[10]

On March 14, 2100 (which will be February 29, 2100 in the Julian calendar), the difference between the Julian calendar and the Gregorian calendar reaches 14 days. Since 14 is divisible by 7, this will be the first time in history since its inception that the Gregorian calendar will have the same day of the week for each day of the month for the whole year as the Julian calendar. This will last until February 28, 2200 of the Gregorian Calendar.

2100 will not be a leap year since it qualifies as a year that is divisible by 100, but not by 400.

FAT file systems theoretically support dates up to December 31, 2107 (though officially only up to December 31, 2099).

March 17, 2160 – Unless changes are made as to when Easter can be observed, this particular March 17 will fall within Holy Week for the first time since 2008 and fall on the same day (Monday) as it did in that year, likely requiring the movement of the Feast of Saint Patrick's Day to another date.[13]

June 25, 2150: Solar eclipse[21] of 7 min 14 s, Solar Saros 139.
Exceeding 7 minutes of totality, this will be the first time this has happened in 177 years; the last one occurred on June 30, 1973.[22] when the Concorde prototype followed the totality spot for 73 minutes.

Total solar eclipse of July 16, 2186[26] of 7 min 29 s (very close to the theoretical maximum), Saros 139, "crowning" this series.
This is predicted to be the longest eclipse during the current 10,000 year period, from 4000 BC to 6000 AD (eclipse predictions by Fred Espenak, NASA/GSFC.DEPP).[27]